Located near the lawless Terminus Systems, the Attican Traverse is the true frontier of Citadel space. The area contains many worlds once inhabited by the Protheans, and many Mass Relays are located throughout the systems of the Traverse. Colonies established in the Traverse are subject to constant raids and attacks from the nearby Terminus Systems, but the systems in the Traverse contain worlds rich in resources, and Prothean ruins and technology.